9 Oil wells and 2 water wells. Average oil production of single well was
8.4 bbl / day, 93.4% of Water-cut

Measures to enhance oil recovery

Water flooding with the mixtures of rhamnolipid (0.2-1.0% ), chemical surfactant ( 0.01-0.2% ) and polymer ( 0.05-0.1% ). Slug injection with the first slug high concentration and the second low concentration.

Result

During the 14 months, oil production of a single well was enhanced from 8.4 bbl / day to 11.6 bbl / day. Water-cut was decreased by 1.6%, and cumulative incremental oil was more than 14100 bbl.

Wax deposition of oil wellbore has become a serious problem in this oilfield. Hot-washing sometimes caused the oil production to decrease and damage the reservoir formation, and is not cost-effective. And also chemical methods were harmful to health.

Measures

Microbial paraffin removal with the rhamnolipid and lipopeptide of fermentation liquid. The concentration of injection is 2000-7000 ppm.

Result

Greatly extended the cycle of hot-washing ( from 30 days to 168 days), thereby reducing the number of hot-washing treatments; provided economic benefits of $ 400,000